$myroutes =  function () {
    Route::get('/news', 'NewsController@index')->name('news_index');
    Route::get('/article', 'ArticleController@index')->name('article_index');
};

Route::group(['prefix' => 'chemistry'], $myroutes);
Route::group(['prefix' => 'math'], $myroutes);
Route::group(['prefix' => 'geography'], $myroutes);